Key interlock scheme

Penta-head bolt doors

Unbalance scheme for each step: Placing a detection scheme on each individual step will trip the affected step only and allow the remaining steps to function without hindrance. The affected step will be locked out until maintenance is performed and the step is reset.

A main unbalance detection scheme: This method monitors the main capacitor bus feeding all the steps. All steps will drop and lock out if any step has an unbalance. The relay will have to be set for the smallest capacitor in a step.

No Unbalance Detection

Ground switch for each step: Placing a ground switch on each individual step will allow the affected step to be grounded, capacitors to discharge and be separated from the rest of the capacitor assembly. This will allow the remaining steps to function without hindrance.

A main ground switch scheme: This method requires more circuitry and less ground switches. All steps will have the capacitor step switch opened. The main disconnect switch will have to be opened separating the bank from the incoming line. Then the capacitor switches will have to be reclosed to allow the all capacitors to discharge.

No Grounding Switch